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QVM: Quaternions, Vectors, Matrices


#include <boost/qvm/map_mat_vec.hpp>

namespace boost
    namespace qvm
        //Only enabled if: is_mat<A>::value
        template <class A>
        -unspecified-return-type- diag( A & a );

The expression diag(m) returns a view proxy that accesses the main diagonal of the matrix m as a vector.